50 km/h to miles per hour

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?